Lifting jack



Nov. 13, 1928.

J. C. DAWLEY ET AL LIFTING JACK Filed June 19, 1924 3' Sheets-Sheet ATTOE/VEK Nov. 13, 1928.

J. c. IDAWLEY ET AL LIFTING JACK Filed June 19, 1924 3 Sheets-Sheet 664141.2- F aura-r6:

3 Shee eet m NM INVENTORS JIM: C. vlwxzy nanny- F ux 141K?! M10)! 117' RNE Y.

Patented Nov. 13, 1928.

UNITED sra -"asv PATEINT- OFFICE.

JAMES C. DAWLEY, CHARLES D. DERBY, AND ALBERT G. KILIAN, OF DAYTON, OHIO,

ASSIGNORS TO THE J'OYCE-CRIDLAND COMPANY, OF DAYTON, OHIO, A

TION OF OHIO.

OORPOB.A

LIFTING JACK.

Application filed June 19, 1924. Serial No. 721,117.

This invention relates to lifting acks and more particularly to a lifting jack having manually actuated means for controlling the lowering of the load.

One object of the invention is to provide an improved mechanism whereby the actuating device for imparting lifting movement to the lifting element may be utilized to operate the mechanism which Controls the downward movement of the lifting element.

A further object oftheinvention is to provide a mechanism of this character in which the controlling means will normally be positively locked against movement; and further to provide means for simultaneously releasing the controlling mechanism andoperatively connecting the same with the actuating device. I

A further object of the invention is to provide .a mechanism of this kind which will be simple in its construction, of a strong durable character and positive in its operation.

ther objectsof the invention will appear as the mechanism is described in detail.

In the accompanying drawings Fig. 1 is a side elevation, partly broken away, of a jack embodying our invention; Fig. 2 is a front elevation of the same, partly broken away and partly in section; Fig. 3 is a side elevation of the actuating and controlling mechanism; Fig. 4 is a longitudinal sectional view taken centrally through the controlling mechanism; Fig. 5 is a section taken on the line 55 of Fig. 2; and Fig. 6 is a sectional view taken centrally through the clutch and lock mechanism.

In these drawings we have illustrated one embodiment of our invention and have shown the same as applied to a lifting jack of the The jack as here shown, comprises a base 1 having rigidly mounted thereon and extending upwardly therefrom a tubular housing or standard 2 which, in the present instance, is screw threaded onto the base.

Rigidly mounted within this standard is a screw 3 which in the present device is rigidly secured at its lower'end to abeveled gear 4 Y t which rests upon and is supported by a bear ing plate 5 which in turn is rotatably mount-f ed on a second bearing plate 6, carried by the base 1, through the medium of a series of anti-friction balls 7. Mounted upon the screw 3 is a lifting element which is actuated by said screw to lift the load. As here shown,

this lifting element comprises a nut 8 having threaded'connection with the screw and having rigidly secured thereto a tubular member 9 which is slidably mounted in the standard 2 and'extends above the upper end of the same where it is provided witha cap or load engaging element 10. The lifting mechanism is preferably'of the high speed type and, in the present instance, the pitch of the threads on the screw and nut is such that when unrestrained the lifting element will move downward under the weight of the load.

Suitable operating mechanism is provided forrotating the screw and thus elevating the lifting element. In the present instance this operating mechanism comprises a rotatable member, such as a shaft 11, having at its inner end a beveled gear 12 which meshes with the beveled gear 4. This shaft is journaled in bearings 13 and 14 in a housing 15 which is rigidly secured to one side of the standard 2. The end of the shaft extends beyond the outside of the housing and has connected therewith a suitable actuating device, which is here shown as a lever socket 16, rigidly secured to a sleeve 17 mounted on the shaft 11 and rotatably mounted in a bearing 18 on.

ratchet wheel 20 rigidly secured to the shaft 11 so'that when the lever socket is rotated in one direction the pawl will engage the ratchet wheel and impart forward movement to the shaft, thereby causing the lifting element to be elevated. The lever socket has the usual socket portion 21 adapted to receive a lever or handle by means of which movement may be imparted to the actuating device.

1 Associated with the rotatable operating will move downwardly under the weight of the load the controlling mechanism will restrain this movement and thus prevent the downward movement of the load, but when the lifting element will not move downwardly under theweight of the load, either because ofaits construction or for any other reason, the controlling device will positively move the same downwardly. The controlling mechanism may take variousforms but, in the present construction, it comprises a worm gear 22 rotatably mounted on the shaft 11 so that it remains stationary when this shaft is the wormgear has rigidly secured thereto a clu'tch member 23 withwhichcooperates a second clutch member 24 slidably and non Springs rotated ina forward direction.

provided forfautomatically connecting the worm gear'with the shaft when the shaft is rotated in arev'erse direct on. To this end rotatably-mounted on the shaft 11. 25 serve to press this second clutch member 24 into engagementwith the clutchmember 23 and the clutch teeth are of sucha character that when the shaft is rotated in a forward direction the teeth of the member 2 1 will ride over the teeth of the clutch member 23,

V thus permitting the shaft to rotate independently of the worm gear, but when the shaft is rotated in a reverse dlrectionthe teeth of the clutch member at will 'operatively engage the teeth of the clutch member 28 and cause the worm gear to rotate with the shaft and consequently cause the worm gear to lock the shaft against rotation when the worm gear is held against rotation. I Cooperating with the worm gear is a worm 26 which, in

1 -the present instance, is mounted on a shaft critical point so that the worm wheel will 27 extending transversely to and arranged above the shaft 11. Preferably the pitch of the threads-011 the spiral gear, that is, the worm and the Worm wheel, is just above the Y not drive the worm but when the worm is sta rotation.

tionarythe worm wheel will be locked against Rigidly connected with the worm 26 is a'spiral gear 28 which, in the present 7 device, is also mounted onthe shaft 27. The gear 28 1s rlgldly connectedwith the gear or worm 26'and both members have hub portions or sleeves, 29. and 30, respectively, which are rigidly connected one to the other at their abutting-ends; The spiral gear 28 meshes with a second spiral gear 81 rigidly secured to a, shaft 32 extending parallel with the shaft lland having secured thereto near its outer enda pinion 33. This pinion 33 meshes with agear34which is mounted for rotation about the axis ofthe shaftll and is rotatable independently ofthat shaft. In the present construction, thegear is provided with a hub portioir35 which is journaled on the outer surface of'a boss 36 forming part of the bear ing .In order to'operate thespi'ral gear.-

mg and cause the loadto move downwardly,

Means are either under its own weight or by the positive driving action of the gearing, we have provided meansfor connectingthe 'ear 3Lwith a manner that the movement of thisactuating devicein a reversed rection will operatethe gear 34L andconsequently the spirallgearing.

In the present construction the hub portion 351st the gear 34 is provided with clutch teeth 37 with which cooperate the teeth of a clutch member88'slidably but non-rotatably mounted on the sleeve 17, with which the ac tuating device is connected; The clutch member 38 is. moved into and outof operative en gagement with the teeth 37 ofthe clutch member 35 by means of a yoke 39wh1chf1shere shown'a's annular inform and extends entirely about theclutch member 38, the latter" being provided with acircumferential groove 40' to receive pins 41 carried by theyolre. The yoke is provided'on its lower side with anarm 42 which is pivotally mounted between the actuating device for the shaft 11 in such lugs 43 carried by the outer wall of the casing. The upper endof the yoke is connected w th a suitable manually op erated'actuating devlcewhich, as here shown, comprises an arm 44 pivotally mounted on a pin'for shaft 45 which is supported in lugs 46 carried by the outer wall of the'housing; The lower end of the arm 44k is slotted to receive a pin at? mounted in lugs 48 which extend upwardly from the yoke. Rigidly connected with the 53. which tends to hold the plunger in its ups permost position and thereby retain the yoke and the clutch member 48in their retracted positions. The upper portion of the rod extends through an opening in the top wall'of;

the housing and is provided with anoperating member, such as a knob 54, by meansof' which it may be depressed. It will be obvi-' ous that the depressionof the plunger jl will rock the arms &9 and tt about the axis ofthe shaft 45 and thus cause the yoke 89 to move the clutch 38 into operativeengagement with the clutch teeth 37, thereby rigidly connecting the gear 34 with the sleeve 17 and the actuating device for the shaft ll. 7

Means are also provided for rigidly locking the controlling mechanism, or spiral gear ing,against movement and thus locking the lifting element against downward movement. in the presentdevice, this loekingmeans opllO e'rates on the gear 34; and is here shown as a or dog, or locking finger 55 which is mounted for movement about the axis of the pm and is rigidly connectedwith the arm 49.

The inner end of this locking'member or dog to release thespiral gearing substantially simultaneously with the establishment of the connection bctween'the same and the actuating device. in the eventthe' lifting element does not move downwardly of the load, for any reason whatsoever, and it is desirable to drive the one downwardly, it is necessary that the worm gear 22 shall be rigidly connected with the shaft 11 so as topositively rotate that shaft. To this end we have provided a plunger 5'? which is slidably mounted in the housing 15 and has its lower end arranged to enterthe spate between that clutch member 24 and a fixed part of the housing, the end of the plunger being tapered so that it can be forced into this space, thereby forcing the clutch member-2st into operative engagement with the clutch member 23 and loosing, the same in that position. The upper end of the plunger Xtends beyond the top wall of the housing where it is readily accessible for operation and a spring 58 acts on the plunger to hold the same normally in its elevated or inoperative position. I

The operation of the mechanism will be readily understood from the foregoing de scription and it will be apparent thatwhen the actuating device 16 is rotated in a forward direction it will be co-nnected through the pawl and ratchet mechanism with the shaft 11 and the latter will be rotated to impart i't'ting movement to the lifting element. The latch 38 being in its retracted positiona'nd he locking dog 55 in engagement with the car {A the spiral gearing will be held against rotation and the li ting element positivel locked, thus rendering it impossible to move the load eownwardly. V fhen it is desired to lower the load the plunger51 is actuated to clutch the sleeve 17 to the gear 34 andto move the locking dog 55 into its inoperative POSF tion. While the plunger is held in this position the actuating device or lever socket 16 is rotated reverse direction, it being preferably provided with a knob or handle 59 for this purpose. This rotation of the actuating device istransmitted through the clutch and gear 34 to the spiral gearing, thus rotating the same and thereby permitting the shaft 11 to rotate due to the downward thrust of the load. Should the load fail to move downward-under its own weight the plunger 57 is actuated to cause the worm gear 22 to be rigidly connected with the shaftso that the rotation of the worm under the weight gear will also rotate the shaft in a reverse direction, thus driving the lifting element downwardly. I

While we have shown and described one embodiment of our invention Wewish it to be understood that we do not desire to be limited to the details thereof as various modifications may appear to a person skilled in the art.

Having now fully described our invention,

what we claim as new and'desire to secure by Letters Patent, is: i

1. In a lifting. jack, a lifting element, mechanism comprising an actuating member for operating said lifting element and elevating a load, mechanism to control the do wnward movement of said lifting element, and means for connecting said actuating member with said controlling mechanism to so actuate the latter that the lifting element will move downwardly, said actuating member being movable in one direction to elevate the load and being movable in the other direction t lower the load.

2. In a lifting jack, a lifting element,

mechanism comprising an actuating member for operating said lifting element to elevate the load, mechanism to control the downward movement of said lifting element, a lock to hold said controlling mechanism normally against movement, and means to actuate said lock to release said controlling mechanism and to operatively connect said actuating member with said controlling mechanism, whereby the latter may be operated by said actuating member to lower the load.

3. In a lifting jack, a lifting element, mechanismcomprising an actuating member for operating said lifting element to elevate the load, mechanism to control the downward movement of said lifting element, a lock to hold said controlling mechanism normally against movement, and a single manually operated device to actuate said lock to release said" controlling mechanism and to operatively connect,saidact-uating member with said controlling mechanism, whereby the latter may be operated by said actuating member to lower the load.

i. In a lifting jack, a lifting element, mechanism comprisingan actuating member for operating said lifting element to elevate the load, mechanism to control the downward movement of said lifting element, and means comprising a clutch for operatively connecting said actuating member with said controlling mechanism, and a device to operate said clutch; v

5. In a lifting jack, a lifting element, mechanism comprising an actuating member for operating said lifting element to elevate the load, mechanism to control the downward movement of said lifting element, meanscom prising a clutch for operatively connecting said actuatingmember with said controlling lifting element, means comprising a clutch.

for operatively connecting said actuating member with sa d controlling mechanism, a clutch operating member, a pivoted arm oper atively connected with said clutch operatingmember, alocking member operatively connected with said arm and movable into and out of a position to loclrsaid controlling mechanism against movement, and a mania ally operated device connected with said arm for actuating said clutch and said lock.

7. In a lifting jack, a lifting element, a rotatable member operatively connectedwith said lifting element, an actuating device rotatable relatively to said rotatable member,

means for operatively connecting said actuating device with said rotatable member when said actuating device is rotated in one direction, a spiral gear,means for connecting said spiral gear with said rotatable member When the latter is rotated in a reverse direction, a second spiral gear cooperating with the first mentioned gear, and means operated by the rotation of said actuating device in the other direction for operating said spiral gearing. 7 1

8. In a lifting jack, a lifting element, a rotatable member operatively connected with said lifting element, an actuating device rotatable relatively to said rotatable member,

means for operatively connecting said actesting device with said rotatable member when said actuating device is rotated in one direction, a spiral gear, means for connecting said spiral gear with said rotatable member when the latter is rotated in a reverse direction, a second spiral gear cooperating with the first mentioned gear, and means comprising a clutch for operatively connecting said spiral gearing with said actuating device to cause said gearing to be actuated by the rotation of said actuating device in the other direction.

9. In a lifting jack, a lifting element, a shaft operativelyconnected with said lifting element, a sleeve rotatably mounted on said shaft, an actuating. device carried by said sleeve, means for operatively connecting said actuating device with said shaft, a spiral gear rotatable about the axis of said shaft, means for connecting said spiral gear with said shaft when the latter is rotated in a reverse direction. a second spiral gear 00- operating with the first mentioned gear, a clutch-member connected with said second spiral gear, a cooperating clutch member car- 'ried by said sleeve, and means for actuating shaft, an actuating device carried hy'said sleeve, means for operatively connecting'said actuating device with said shaft, a spiral" gear rotatable about the axis of said shaft, means for connecting said spiralv gear with said shaft when the latter is rotated in a reverse direction, a second spiral gearcoop eratirig-with the first mentioned gear,'a clutch member connected with said second spiral gear, a cooperating clutch'meinber carried by said sleeve, a yoke pivotally mounted at one side of said shaft and operatively connected with the last mentioned clutch memher, a pivoted arm having operative connectioii with'said yoke on the other side of said shaft, an actuating arm connected with the first mentioned arm, and an actuating. rod

operatively connected withsaid actuating arm. r I

11; In a lifting jack, a lifting element, a shaft opcratively connected withsaid lifting element, a sleeve rotatably mounted on said shaft, an actuating device carried by said sleeve, means for operatively connecting said actuating device with SillCl shaft, a spiral gear rotatable about the axis of said shaft,

means for connecting said spiral gear with said shaft when the latter is rotated in. a

reverse direction, a secondspiral gear 00- operating with the firstmentioiied gear, a gear rotatable about the axis of said shaft and operativelv connected with said second spiral gear, a clutch member carried by said last mentioned gear, asecondclutch member slidably and non-rotatably' mounted on saidsleeve, a device for shifting said'second clutch meinberinto and outof operative engage ment with the first'mentioned clutch member,

and means for actuating said clutch shifting device.

12; In alifting jack, a liftingeleiiient, a

shaft operatively connected with said lifting element, a sleeve rotatably mounted on said shaft, an actuating device carried by said sleeve, means for operatively connecting said actuating device with said shaft, a spiral gear rotatable-about the-aXis-of said shaft, means for connecting said spiral gear with said shaft when the latter, is rotated in a reverse direction, a second, spiral gear cooperating with the first mentioned gear, a gear rotat- I able about the axis of said shaft and operatively connected withv said second spiral gear,

a clutch member carried by said last mentioned gear, a second clutch member slidably and non-rotatably mounted on said sleeve,'a device for shifting said second clutch'in'emher into and out of operative engagement with the first mentioned clutch member, a

locking member movable into and out of engagement with said last mentioned gear, and means for moving said locking member into an inoperative position and for actuating said clutch shifting, device to connect said last mentioned gear with the actuating device for said shaft. 7 i

' 13. In a lifting jack, a lifting element, a shaft operatively connected with said lifting element, a sleeve rotatably mounted on said shaft, an actuating device carried by said sleeve, a pawl and ratchet connection between said actuating device'and said shaft, a spiral gear rotatable about the axis of said shaft, means for connecting said spiral gear with said shaft when the latter is rotated in a reverse direction, a second spiral gear 00- shaft, a clutch member connected with the,

last mentioned gear, a second clutch member slidably and non-rotatably mounted on said sleeve, and a clutch shifting device for moving said second clutch member into and out of engagement with the first mentioned clutch member, whereby said spiral gearing maybe operated by moving the actuating device for said shaft in a reverse direction;

14. In a lifting jack, a lifting element, a shaft operatively connected with said lifting element, a sleeve rotatably mounted on said shaft, an actuating device carried by said sleeve, a pawl and ratchet connection between said actuating device and said shaft, a spiral gear rotatable about the axis of said shaft, means for connecting said spiral gear with said shaft when the latter is rotated in a reverse direction, a second spiral gear cooperating with the first mentioned spiral gear, a gear connected with said second spiral gear and rotatable about the axis of said shaft, a clutch member connected with the last mentioned gear, a second clutch member slidably and non-rotatably mounted on said sleeve, a clutch shifting device operatively connected with said second clutch member, a locking device movable into and out of locking engagement with said last mentioned gear, and an actuating member operatively connected withsaid clutch shifting device and said locking member, whereby said gear may be released for operation and operatively connected with the actuating device for said shaft.

15. In a lifting jack, a lifting element, a

shaft operatively connected with said lift 7 "gear cooperating with the first mentioned.

spiral gear, a gearconnected with saidsec- 0nd spiral gear and rotatable about the axis of said shaft, a' clutch member connected with the last mentioned gear, a second clutch member slidably and non-rotatably mounted on said sleeve, a clutch shifting'device pivotally mounted on one side of said shaft and operatively connected with said second clutch member, an arm pivotally mounted on the other side of said shaft and operatively connected with said clutch shifting device, an actuating arm ri idly connected with said pivoted arm, a locliing arm rigidly connected with said actuating arm and movable into and out of locking engagement with said last mentioned gear, and a plunger operatively connected with said actuating arm,

. 16. In a lifting jack, a lifting element, a a

shaft operatively connected with said lifting element, an actuating device, means for operatively connecting said actuating device with said shaft when the actuating device is rotated in one direction, a spiral gear rotatably mounted on said shaft, a one way clutch to connect said spiral gear with said shaft when the shaft rotates in a reverse direction, a second spiral gear cooperating with the first mentioned spiral gear, a gear rotatable about the axis of said shaft and operatively connected withv said second spiral gear, means for operatively connecting said last mentioned gear with said actuating device for rotation thereby when the actuating device is'moved in arever'se direction, and means for causing said spiral gear to be positively connected with said shaft. v

In testimony whereof, we aflix our signatures hereto. 

